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* fix: balanced pool * fixup * fixup
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Original file line number | Diff line number | Diff line change |
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'use strict' | ||
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const Dispatcher = require('./dispatcher') | ||
const { | ||
ClientDestroyedError, | ||
ClientClosedError, | ||
InvalidArgumentError | ||
} = require('./core/errors') | ||
const FixedQueue = require('./node/fixed-queue') | ||
const { kSize, kRunning, kPending, kBusy } = require('./core/symbols') | ||
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const kClients = Symbol('clients') | ||
const kNeedDrain = Symbol('needDrain') | ||
const kQueue = Symbol('queue') | ||
const kDestroyed = Symbol('destroyed') | ||
const kClosedPromise = Symbol('closed promise') | ||
const kClosedResolve = Symbol('closed resolve') | ||
const kOnDrain = Symbol('onDrain') | ||
const kOnConnect = Symbol('onConnect') | ||
const kOnDisconnect = Symbol('onDisconnect') | ||
const kOnConnectionError = Symbol('onConnectionError') | ||
const kQueued = Symbol('queued') | ||
const kDispatch = Symbol('dispatch') | ||
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class PoolBase extends Dispatcher { | ||
constructor () { | ||
super() | ||
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this[kQueue] = new FixedQueue() | ||
this[kClosedPromise] = null | ||
this[kClosedResolve] = null | ||
this[kDestroyed] = false | ||
this[kClients] = [] | ||
this[kNeedDrain] = false | ||
this[kQueued] = 0 | ||
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const pool = this | ||
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this[kOnDrain] = function onDrain (origin, targets) { | ||
const queue = pool[kQueue] | ||
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let needDrain = false | ||
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while (!needDrain) { | ||
const item = queue.shift() | ||
if (!item) { | ||
break | ||
} | ||
pool[kQueued]-- | ||
needDrain = !this.dispatch(item.opts, item.handler) | ||
} | ||
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this[kNeedDrain] = needDrain | ||
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if (!this[kNeedDrain] && pool[kNeedDrain]) { | ||
pool[kNeedDrain] = false | ||
pool.emit('drain', origin, [pool, ...targets]) | ||
} | ||
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if (pool[kClosedResolve] && queue.isEmpty()) { | ||
Promise | ||
.all(pool[kClients].map(c => c.close())) | ||
.then(pool[kClosedResolve]) | ||
} | ||
} | ||
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this[kOnConnect] = (origin, targets) => { | ||
pool.emit('connect', origin, [pool, ...targets]) | ||
} | ||
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this[kOnDisconnect] = (origin, targets, err) => { | ||
pool.emit('disconnect', origin, [pool, ...targets], err) | ||
} | ||
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this[kOnConnectionError] = (origin, targets, err) => { | ||
pool.emit('connectionError', origin, [pool, ...targets], err) | ||
} | ||
} | ||
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get [kBusy] () { | ||
return this[kNeedDrain] | ||
} | ||
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get [kPending] () { | ||
let ret = this[kQueued] | ||
for (const { [kPending]: pending } of this[kClients]) { | ||
ret += pending | ||
} | ||
return ret | ||
} | ||
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get [kRunning] () { | ||
let ret = 0 | ||
for (const { [kRunning]: running } of this[kClients]) { | ||
ret += running | ||
} | ||
return ret | ||
} | ||
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get [kSize] () { | ||
let ret = this[kQueued] | ||
for (const { [kSize]: size } of this[kClients]) { | ||
ret += size | ||
} | ||
return ret | ||
} | ||
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get destroyed () { | ||
return this[kDestroyed] | ||
} | ||
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get closed () { | ||
return this[kClosedPromise] != null | ||
} | ||
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close (cb) { | ||
try { | ||
if (this[kDestroyed]) { | ||
throw new ClientDestroyedError() | ||
} | ||
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if (!this[kClosedPromise]) { | ||
if (this[kQueue].isEmpty()) { | ||
this[kClosedPromise] = Promise.all(this[kClients].map(c => c.close())) | ||
} else { | ||
this[kClosedPromise] = new Promise((resolve) => { | ||
this[kClosedResolve] = resolve | ||
}) | ||
} | ||
this[kClosedPromise] = this[kClosedPromise].then(() => { | ||
this[kDestroyed] = true | ||
}) | ||
} | ||
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if (cb) { | ||
this[kClosedPromise].then(() => cb(null, null)) | ||
} else { | ||
return this[kClosedPromise] | ||
} | ||
} catch (err) { | ||
if (cb) { | ||
cb(err) | ||
} else { | ||
return Promise.reject(err) | ||
} | ||
} | ||
} | ||
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destroy (err, cb) { | ||
this[kDestroyed] = true | ||
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if (typeof err === 'function') { | ||
cb = err | ||
err = null | ||
} | ||
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if (!err) { | ||
err = new ClientDestroyedError() | ||
} | ||
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while (true) { | ||
const item = this[kQueue].shift() | ||
if (!item) { | ||
break | ||
} | ||
item.handler.onError(err) | ||
} | ||
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const promise = Promise.all(this[kClients].map(c => c.destroy(err))) | ||
if (cb) { | ||
promise.then(() => cb(null, null)) | ||
} else { | ||
return promise | ||
} | ||
} | ||
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dispatch (opts, handler) { | ||
if (!handler || typeof handler !== 'object') { | ||
throw new InvalidArgumentError('handler must be an object') | ||
} | ||
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try { | ||
if (this[kDestroyed]) { | ||
throw new ClientDestroyedError() | ||
} | ||
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if (this[kClosedPromise]) { | ||
throw new ClientClosedError() | ||
} | ||
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const dispatcher = this[kDispatch]() | ||
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if (!dispatcher) { | ||
this[kNeedDrain] = true | ||
this[kQueue].push({ opts, handler }) | ||
this[kQueued]++ | ||
} else if (!dispatcher.dispatch(opts, handler)) { | ||
dispatcher[kNeedDrain] = true | ||
this[kNeedDrain] = this[kClients].some(dispatcher => !dispatcher[kNeedDrain]) | ||
} | ||
} catch (err) { | ||
if (typeof handler.onError !== 'function') { | ||
throw new InvalidArgumentError('invalid onError method') | ||
} | ||
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handler.onError(err) | ||
} | ||
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return !this[kNeedDrain] | ||
} | ||
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} | ||
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module.exports = { | ||
PoolBase, | ||
kClients, | ||
kNeedDrain, | ||
kOnDrain, | ||
kOnConnect, | ||
kOnDisconnect, | ||
kDispatch, | ||
kOnConnectionError | ||
} |
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